exam Maths Puzzle Numerical Ability

Hi, ive been asked to answer the following questions, and having great difficulty, i have managed to answer the first question, (although with ALOT of help), but i was wondering if

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a jet plane travelling at a constant speeed goes 1200 mi with the wind , then turns around and travel for 1000 mi against the wind . If the speed of the wind is constant 50mph , an How do I write 243 in exponential notation